JP3160946U - Overload protector and equipment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overload protector capable of saving energy of a starting device by using a heater and a bimetal having the same specifications as those of a normal overload protector. A thermo-switch unit for interrupting useless current that continues to flow to a positive temperature coefficient thermistor of a starter after completion of start-up of a compressor motor is a thermostat formed on the outside integrally with a heater housing wall of a protector unit case. Built in the switch housing and covered with a second cover made of resin, it is heated by the temperature rise of the compressor outer surface due to the operation of the compressor motor and the temperature rise of the heater housing wall due to the heat generated by the heater. By opening the circuit, the current of the positive temperature coefficient thermistor is cut off. [Selection] Figure 2

Description

  The present invention relates to an overload protector suitable for protecting a compressor constituting a refrigeration cycle such as an air conditioner or an electric refrigerator, and also to save energy in a starter of a compressor motor, and an apparatus using the same.

  For example, a starter is provided together with an overload protector in a single-phase induction motor that drives a compressor such as a refrigerator or an air conditioner. As a conventional starting device of this type, as shown in FIG. 8, a positive temperature coefficient thermistor starting device 50 is connected in series to a starting winding 62 energized by an AC power supply 90 together with a main winding 61. Has been. In such a starter, when the compressor motor 60 is started, the starter winding current flows through the starter winding 62 because the positive temperature coefficient thermistor exhibits a low electrical resistance value. The start-up winding current causes the positive temperature coefficient thermistor to self-heat and become high resistance, and the current to the start-up winding 62 is limited. In this configuration, even during steady operation after completion of the start-up of the compressor motor, a voltage higher than the normal power supply voltage is applied to the positive characteristic thermistor due to the induced voltage generated in the start-up winding 62 and self-heats. Since it continues, it will always consume about 2-4W electric power, and there exists a problem on energy saving.

Therefore, conventionally, for example, Patent Literature 1 to Patent Literature 3 disclose a method in which a thermo switch connected in series with an activation device is opened after the completion of activation of the compressor motor to cut off the current of the positive temperature coefficient thermistor.
Published Patent Publication No. Hei 11-31445 Published patent publication Sho 56-162985 Published Patent Publication No. Hei 4-289786

  In the invention of Patent Document 1, a second heater is provided in series with the thermo switch, the bimetal of the thermo switch is heated from both sides by the heater of the protector unit and the second heater, and the protector unit is opened after the thermo switch is opened. In this configuration, the open circuit state is maintained only with the heaters, and there is no wall between the heater of the protector part and the bimetal of the thermo switch, and the open state is maintained.

  As a result, the effect of opening the thermo switch in a short time after the start-up of the compressor motor can be expected, but the heater of the protector must generate more heat than the heater of a normal overload protector that does not have an energy saving function. In addition to impairing the energy saving effect, it is necessary to reexamine the matching of protection characteristics with many types of compressors due to differences in capacity, etc., using heaters dedicated to energy-saving overload protectors that generate a lot of heat. , Takes a lot of time and effort.

  In the invention of Patent Document 2, the bimetal of the thermo switch is heated by the heat generated by at least one of the heater of the protector part and the positive temperature coefficient thermistor of the starter, and after the thermo switch is opened, only the heater of the protector part is opened. However, this structure also has a wall between the heater of the protector and the bimetal of the thermo switch, and not only has the same problem as in Patent Document 1, but also can be attached to the compressor. Not considered.

  Next, in the invention of Patent Document 3, a thermo switch connected in series to a positive temperature coefficient thermistor and thermally coupled to a heater of a protector section is opened by receiving heat generated by the heater when a starting current flows. It is configured.

  The starting current of a single-phase induction motor is generally several times the rated current, and the heat generation of the heater is squared, so the heat generation at the moment of starting is very large, but the time required for starting the compressor motor is Usually, it is only around 1 second, and the heat generation amount proportional to the product of power and time is not large. Therefore, although the structure is not shown, in order to open the thermo switch by the heat generation of the heater due to the starting current, the heater and the thermo switch are close to each other without a wall, and further, the heat generation of the heater does not have an energy saving function. It cannot be established unless it is considerably larger than the heater of the overload protector, and has the same problems as Patent Document 1 and Patent Document 2.

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to have 2 to 4 W consumed by a compressor motor starting device with the same heater specifications as a normal overload protector. An object of the present invention is to provide an overload protector having an energy saving function capable of cutting off unnecessary power.

In order to achieve the above object, the invention of claim 1 is directed to a fixed contact plate that supports a fixed contact, a movable contact plate that supports a movable contact that contacts the fixed contact, and the fixed contact plate that swings the movable contact plate. It consists of a bimetal that breaks the contact between the contact and the movable contact, a heater that is connected in series to the fixed contact and the movable contact, and that heats the bimetal, and is sealed with a resin case and cover or stored in a state with few openings. A protector for protecting the compressor motor
It consists of a second stationary contact, a second movable contact, and a second bimetal, and is composed of a normally closed thermoswitch connected in series to a starting device with a positive temperature coefficient thermistor for starting the compressor motor. In overload protector
The thermo-switch part is integrated with the thermo-switch housing part formed on the outside integrally with the heater housing part wall surface of the protector part case, and is covered with a resin-made second cover to operate the compressor motor. The technical feature is that the current of the positive temperature coefficient thermistor is cut off by heating and opening due to the temperature rise of the compressor outer surface atmosphere due to heat and the temperature rise of the heater housing wall surface due to the heat generated by the heater. To do.

  The invention of claim 2 is an overload protector according to claim 1, wherein the overload protector is arranged on the outer shell of the compressor, and the main and start windings of the compressor motor are connected to the inner side of the outer shell. A pin terminal welded to the welding margin of the fixed contact plate protruding outside through the notch of the cover of the protector is inserted into one pin on the outside of the glass terminal, and fixed simultaneously with electrical connection. The technical feature is that the heat of the compressor is easily received by attaching it close to the outer shell of the compressor.

  According to a third aspect of the present invention, in the overload protector according to the first or second aspect, the second movable contact of the thermo switch unit is a twin contact using two contacts.

  The invention of claim 4 is characterized in that, in the overload protector according to claims 1 to 3, a bimetal having a small thermal resistance and a high specific resistance is used for the second bimetal of the thermoswitch unit.

  The invention of claim 5 is that in the overload protector according to claims 1 to 4, the thermoswitch unit second bimetal is a slow action bimetal using a flat plate not subjected to forming processing such as drawing. Technical features.

The invention of claim 6 is a fixed contact plate for supporting a fixed contact, a movable contact plate for supporting a movable contact that contacts the fixed contact, and a contact between the fixed contact and the movable contact by swinging the movable contact plate. It consists of a bimetal that cuts off and a heater that is connected in series with a fixed contact and a movable contact to heat the bimetal, and protects the compressor motor housed in a sealed state with few openings by a resin case and cover Protector section
It consists of a second stationary contact, a second movable contact, and a second bimetal, and is composed of a normally closed thermoswitch connected in series to a starting device with a positive temperature coefficient thermistor for starting the compressor motor. In overload protector
The thermo switch unit is housed in a second case, covered with a second cover, and has a coupling claw portion that fits into a sliding coupling groove formed on the outside of the wall surface of the heater housing portion of the protector unit case. Then, it can be integrated with the protector by sliding and fitting, and the circuit is heated and opened by the temperature rise of the compressor outer surface atmosphere due to the operation of the compressor motor and the temperature rise of the heater housing wall due to the heat generated by the heater. Thus, it is a technical feature that the current of the positive temperature coefficient thermistor is cut off.

The invention of claim 7 is a fixed contact plate for supporting a fixed contact, a movable contact plate for supporting a movable contact that contacts the fixed contact, and a contact between the fixed contact and the movable contact by swinging the movable contact plate. It consists of a bimetal that cuts off and a heater that is connected in series with a fixed contact and a movable contact to heat the bimetal, and protects the compressor motor housed in a sealed state with few openings by a resin case and cover Protector section
It consists of a second stationary contact, a second movable contact, and a second bimetal, and is composed of a normally closed thermoswitch connected in series to a starting device with a positive temperature coefficient thermistor for starting the compressor motor. In overload protector
The thermo switch part is fitted into a resin holder with a thermo switch having a metal outer shell, and the resin holder fits into a slide type connecting groove formed on the outside of the wall surface of the heater housing part of the protector part case. A connecting claw portion that can be integrated with the protector portion by sliding and fitting, and one surface of the metal outer shell is in close contact with the outside of the heater housing wall surface of the protector portion case, and the compressor motor It is technical that the current of the positive temperature coefficient thermistor is cut off by being heated and opened by the temperature rise of the compressor outer surface atmosphere due to the operation of the heater and the temperature rise of the heater housing wall surface due to the heat generated by the heater. Features.

  According to the eighth aspect of the present invention, the overload protector according to any one of the first to seventh aspects is fitted into an overload protector housing provided in the starter using a positive temperature coefficient thermistor, and the outer shell of the compressor is integrated with the starter. It is a technical feature that it can be attached to a 3-pin glass terminal disposed on the board.

  In the overload protector according to claim 1, the protector part is sealed with a resin case and cover, or is housed in a state with a small number of openings, so that the characteristics of the heater and bimetal are normal overloads that do not have an energy saving function. The heater and bimetal of the protector can be used as they are, and it is not necessary to increase the heat generation of the heater, so the energy saving effect is not impaired, and it is also necessary to reconsider the matching of protection characteristics with many types of compressors due to differences in capacity etc. Absent.

  In the overload protector according to claim 2, the pin terminal is inserted and connected to one pin of the 3-pin glass terminal disposed in the outer shell of the compressor, and is fixed in close proximity to the outer shell of the compressor. Therefore, it is easy to receive the heat of the compressor, and the temperature of the thermo switch part can be kept high. Therefore, when starting the compressor motor, the temperature of the protector part heater housing wall can be increased to open the thermo switch in a short time. it can.

In order for the overload protector of the present invention to fully exert the energy saving effect, the thermo switch quickly detects the temperature rise of the protector heater housing wall when starting the compressor motor, and opens the compressor when the motor stops. Even when the temperature of the surface atmosphere is high, it is necessary to detect the temperature drop of the heater housing wall surface and reliably close it to prepare for the next start, and it is desirable to make the difference between the open temperature and the close temperature as small as possible.
In the overload protector according to the third aspect, the difference between the open temperature and the closed temperature cannot be increased because the second movable contact of the thermo switch unit is a twin contact using two contacts. The contact failure of a small thermoswitch can be prevented.

  In the overload protector according to claim 4, by using a bimetal having a good thermal conductivity and a small specific resistance for the second bimetal of the thermo switch unit, the temperature of the protector unit heater housing wall surface rises when the compressor motor is started. Can be detected quickly, and the thermoswitch can be opened in a short time.

  In the overload protector according to claim 5, the difference between the opening temperature and the closing temperature is substantially reduced by using a flat plate not subjected to forming processing such as drawing for the second bimetal of the thermo switch unit. It can be made zero, and can be opened and closed reliably by the rise and fall of the protector heater housing wall surface temperature. Further, since forming processing such as drawing is not required, the cost is reduced, and stress during bimetal operation is small and the life is long.

  In the overload protector according to claim 6, since the case and the cover of each of the protector part and the thermo switch part are separate and can be integrated by a slide type connecting part, for customers who do not need the energy saving function. The protector part can be sold alone. Furthermore, it is only necessary to separately produce and stock a protector section, which has a wide variety of products, and a thermoswitch unit that requires a small number of products but requires multiple products in order to match the protection characteristics of compressors with many models due to differences in capacity. And shortened delivery time due to parallel production.

  In the overload protector according to claim 7, since the outer shell of the thermo switch is made of a metal having good heat conduction, and one surface of the outer shell is almost in close contact with the outer surface of the heater housing portion of the protector portion case, It is possible to quickly detect a temperature rise on the wall surface of the housing and open the circuit.

  The overload protector according to claim 8 is fitted into an overload protector housing provided in the starter by a positive temperature coefficient thermistor, and is attached to a 3-pin glass terminal that is integrally provided with the starter and disposed in the outer shell of the compressor. Because it is possible, the installation to the compressor is completed with a single touch, improving the workability at the compressor manufacturer or refrigerator manufacturer that is the customer.

FIG. 1A is a plan view, FIG. 1B is an isometric view, and FIG. 1C is a front view, showing a configuration of an overload protector according to a first embodiment of the present invention. FIG. 1D is a right side view. 2A is a rear view of the overload protector shown in FIG. 1, FIG. 2B is an arrow view cut along A1-A2, and FIG. 2C is cut along B1-B2. It is an arrow view. It is an electric circuit diagram which shows the connection of the overload protector of this invention, and a starting device. 4 (A) is a front view of a 3-pin glass terminal disposed on the compressor shell, FIG. 4 (B) is a left side view (the compressor shell is cut at C1-C2), and FIG. FIGS. 4C and 4D are diagrams in which the overload protector according to the first embodiment of the present invention is attached to FIGS. 4A and 4B, respectively. It is the figure which made the 2nd movable contact of the thermoswitch part of the overload protector of this invention the twin contact, FIG.5 (A) is the front view by which the 2nd movable contact was welded to the 2nd bimetal, figure 5 (B) is a left side view of the same, and FIG. 5 (C) is a perspective view of a cross section showing a state where it is incorporated in the thermoswitch section. The structure of the overload protector which concerns on 2nd Embodiment of this invention is shown, FIG. 6 (A) is a front view of a thermoswitch part, and FIG. 6 (B) is a right view. FIG. 6C is a plan view of the protector portion, and FIG. 6D is a rear view. FIG. 6E is a diagram in which a thermoswitch unit is attached to the back surface of the protector unit, and FIG. 6F is a view taken along the line D1-D2 in FIG. 6E. The structure of the overload protector which concerns on 3rd Embodiment of this invention is shown, FIG. 7 (A) is a front view of a thermoswitch part, FIG.7 (B) is a right view. FIG. 7C is a plan view of the protector portion, and FIG. 7D is a rear view. FIG. 7E is a view in which a thermoswitch unit is attached to the back surface of the protector unit, and FIG. 7F is a view taken in the direction of arrows E1-E2 in FIG. FIG. 8A shows a configuration of an overload protector and a starter according to a fourth embodiment of the present invention, FIG. 8A is a bottom view of the starter before the overload protector is fitted, and FIG. 8 (C) is a bottom view of the state in which the overload protector is fitted and integrated with the activation device, FIG. 8 (D) is a side view thereof, and FIG. 8 (E) is an equivalent angle projection view. 8 (F) is a view showing a state where it is attached to a 3-pin glass terminal disposed in the outer shell of the compressor. It is an electric circuit diagram which shows the connection of the conventional overload protector and a starting device.

[First Embodiment]
The configuration of the first embodiment showing claim 1 of the present invention will be described with reference to FIGS. The protector 20 of the overload protector 10 includes a fixed contact plate 8 that supports the fixed contact 1 and a movable contact that supports the movable contact 2 that contacts the fixed contact 1 as shown in FIGS. A plate-shaped bimetal 4 that oscillates the plate 3, the movable contact plate 3 and breaks the contact between the fixed contact 1 and the movable contact 2, and a heater that is connected in series to the fixed contact 1 and the movable contact 2 and heats the bimetal 4 5 and the like, which are sealed by a resin case 6 and a cover 7 or housed in a state with few openings.

  Next, the thermo switch unit 30 includes the second fixed contact 11, the second movable contact 12, and the second bimetal 14, and is formed on the outside integrally with the heater housing wall surface 6 a of the protector unit case 6. The lid is covered with a second cover 17 made of resin and incorporated in the thermoswitch housing 6b.

  FIG. 3 is a circuit diagram showing the connection between the overload protector 10 and the activation device. The protector is disposed between the AC power supply 90 and the C terminal 41 of the 3-pin glass terminal 40 to which the main winding 61 and the auxiliary winding 62 of the compressor motor 60 are connected. The thermoswitch 30 is a positive temperature coefficient thermistor. Is arranged between the starting device 50 and the starting capacitor 71.

The operation of the overload protector described above will be described with reference to FIGS. 3 and 4 by taking a refrigerator as an example.
When the power plug of the refrigerator is first inserted into the outlet, the current of the starter 50 is supplied because the thermostat 30 is not opened for 30 to 60 minutes until the compressor motor 60 generates heat and the temperature of the compressor shell 63 rises. The overload protector 10 is attached to the C terminal 41 of the 3-pin glass terminal 40 disposed in the compressor shell 63 as shown in FIG. After the starter 50 is attached to the electric cover mounting plate 64, it is fitted with an electric cover (not shown), so that once the temperature rises, the electric cover is kept at a relatively high temperature, and the compressor The heater 60 is further heated by the temperature rise of the heater housing wall 6a due to the heat generated by the protector heater 5 due to the operation of the electric motor 60, so that the thermostat 30 is opened, and the activation device is opened. The energy saving state 50 the current is cut off.

  When the temperature in the refrigerator is lowered to the set temperature and the temperature control switch 80 is opened, the compressor motor 60 is stopped and the temperature of the protector unit 20 is lowered, so that the thermostat unit 30 is closed and ready for the next start-up. In the downtime due to the operation of the normal refrigerator temperature control switch 80, the outer temperature of the compressor having a large heat capacity is hardly decreased, and when the temperature control switch 80 is closed and restarted, the thermostat 30 is opened in a short time and the energy saving state is achieved. It becomes.

[Second Embodiment]
With reference to FIG. 6, the structure of the overload protector which concerns on 2nd Embodiment which shows Claim 6 is demonstrated.
In the first embodiment described above with reference to FIG. 2, the thermo switch unit 30 is integrated with the heater housing wall surface 6 a of the protector unit case 6 and is incorporated into the thermo switch housing 6 b formed on the outside to be made of resin. The second cover 17 was covered. On the other hand, in the overload protector of the second embodiment, the thermo switch unit 30 is housed in the second case 16 and covered with the second cover 17, and the second case 16 and the second case Each of the covers 17 has connecting claw portions 16a, 17a, 17b, and 17c that are fitted to slide-type connecting groove portions 6c and 6d formed on the outside of the heater housing portion wall surface 6a of the protector portion case 6, and is slid. By fitting, it is integrated with the protector.

[Third Embodiment]
With reference to FIG. 7, the structure of the overload protector which concerns on 3rd Embodiment which shows Claim 7 is demonstrated.
In the second embodiment described above with reference to FIG. 6, the thermo switch unit 30 is incorporated in a resin case and cover, and is integrated with the protector unit by sliding it into the protector unit heater housing wall surface. It was. On the other hand, in the overload protector according to the third embodiment, the thermo switch unit 30 is configured such that the outer shell 36 of the thermo switch 35 is made of a metal having good heat conduction and is fitted into the resin thermo switch holder 18. The connecting claw portions 18a, 18b, 18c, 18d provided on the metal plate are slid and fitted into sliding connection groove portions 6c, 6d formed outside the heater housing wall surface 6a of the protector portion case 6. The outer shell 36 is integrated with the protector portion 20 in a state where one surface of the outer shell 36 is substantially in close contact with the outside of the heater housing wall surface 6a. As a result, the temperature rise / fall of the heater housing wall surface 6a due to the energization / non-energization of the heater is quickly transmitted to the second bimetal 14, and the thermo switch 35 can be opened / closed in a short time.

[Fourth Embodiment]
With reference to FIG. 8, the structure of the overload protector and starting device which concern on 4th Embodiment which shows Claim 8 is demonstrated.
The activation device 50 according to the fourth embodiment is provided with an overload protector accommodating portion 51 for fitting the overload protector 10 as shown in FIG. After the fitting, the lead wires 31a and 31b drawn out from the thermoswitch are connected to the deposit terminals 52a and 52b of the starter 50, and are disposed in the compressor shell 63 as shown in FIG. 8 (F). It is attached to the 3-pin glass terminal 40.

DESCRIPTION OF SYMBOLS 1 Fixed contact 2 Movable contact 3 Movable contact plate 4 Bimetal 5 Heater 6 Case 6a Heater accommodating part wall surface 6b Thermo switch accommodating part 6c, 6d Sliding connection groove part 6e Notch part of connecting groove part 7 Cover 7a Notch part of cover 8 Fixed contact plate 8a Welding allowance of fixed contact plate 9 Pin terminal 10, 10 'Overload protector 11 Second fixed contact 12 Second movable contact 14 Second bimetal 16 Second case 16a Connection of second case Claw part 17 Second cover 17a, 17b, 17c Connection claw part 18 of second cover Thermo switch holders 18a, 18b, 18c, 18d Connection claw part 20 of thermo switch holder Protector part 30 Thermo switch parts 31a, 31b Lead wire 35 Thermo Switch 36 Thermo Switch Outer 40 3 Pin Glass Terminal 41 3 Pin Glass Turn Null C terminal 50 Positive characteristic thermistor starting device 51 Overload protector housing 52a, 52b Deposit terminal 60 Compressor motor 61 Compressor motor main winding 62 Compressor motor starting winding 63 Compressor outer casing 64 Electrical cover Mounting plate 71 Capacitor for starting 72 Capacitor for driving 80 Refrigerator temperature control switch 90 AC power supply

Claims (9)

A fixed contact plate that supports the fixed contact; a movable contact plate that supports the movable contact that contacts the fixed contact; a bimetal that swings the movable contact plate and disconnects the contact between the fixed contact and the movable contact; and a fixed contact And a protector for protecting the compressor motor housed in a state of being sealed with a resin case and cover, or having a small number of openings, and a heater that is connected in series with the movable contact and that heats the bimetal.
It consists of a second stationary contact, a second movable contact, and a second bimetal, and is composed of a normally closed thermoswitch connected in series to a starting device with a positive temperature coefficient thermistor for starting the compressor motor. In overload protector
The thermo-switch part is integrated with the thermo-switch housing part formed on the outside integrally with the heater housing part wall surface of the protector part case, and is covered with a resin-made second cover to operate the compressor motor. The current of the positive temperature coefficient thermistor is cut off by being heated and opened by the temperature rise of the compressor outer surface due to heat and the temperature rise of the heater housing wall due to the heat generated by the heater. Load protector.   A notch portion of the cover of the protector portion is disposed on one pin outside the three-pin glass terminal which is disposed on the outer shell of the compressor and is connected to the main winding and the starting winding of the compressor motor inside the outer shell. Insert the pin terminal that is welded and fixed to the welding allowance of the fixed contact plate that protrudes to the outside through the electrical connection, fix it at the same time, and install it in close proximity to the outer shell of the compressor. The overload protector according to claim 1, wherein the overload protector is easily received.   The overload protector according to claim 1, wherein the second movable contact of the thermo switch unit is a twin contact using two contacts.   4. The overload protector according to claim 1, wherein a bimetal having a good thermal conductivity and a small specific resistance is used for the second bimetal of the thermo switch unit.   5. The overload protector according to claim 1, wherein the thermo-switch unit second bimetal is a slow action bimetal using a flat plate not subjected to forming processing such as drawing. A fixed contact plate that supports the fixed contact; a movable contact plate that supports the movable contact that contacts the fixed contact; a bimetal that swings the movable contact plate and disconnects the contact between the fixed contact and the movable contact; and a fixed contact And a protector for protecting the compressor motor housed in a state of being sealed with a resin case and cover, or having a small number of openings, and a heater that is connected in series with the movable contact and that heats the bimetal.
It consists of a second stationary contact, a second movable contact, and a second bimetal, and is composed of a normally closed thermoswitch connected in series to a starting device with a positive temperature coefficient thermistor for starting the compressor motor. In overload protector
The thermo switch unit is housed in a second case, covered with a second cover, and has a coupling claw portion that fits into a sliding coupling groove formed on the outside of the wall surface of the heater housing portion of the protector unit case. Then, it can be integrated with the protector by sliding and fitting, and the circuit is heated and opened by the temperature rise of the compressor outer surface atmosphere due to the operation of the compressor motor and the temperature rise of the heater housing wall due to the heat generated by the heater. Thus, an overload protector characterized in that the current of the positive temperature coefficient thermistor is cut off. A fixed contact plate that supports the fixed contact; a movable contact plate that supports the movable contact that contacts the fixed contact; a bimetal that swings the movable contact plate and disconnects the contact between the fixed contact and the movable contact; and a fixed contact And a protector for protecting the compressor motor housed in a state of being sealed with a resin case and cover, or having a small number of openings, and a heater that is connected in series with the movable contact and that heats the bimetal.
It consists of a second stationary contact, a second movable contact, and a second bimetal, and is composed of a normally closed thermoswitch connected in series to a starting device with a positive temperature coefficient thermistor for starting the compressor motor. In overload protector
The thermo switch part is fitted into a resin holder with a thermo switch having a metal outer shell, and the resin holder fits into a slide type connecting groove formed on the outside of the wall surface of the heater housing part of the protector part case. A connecting claw portion that can be integrated with the protector portion by sliding and fitting, and one surface of the metal outer shell is in close contact with the outside of the heater housing wall surface of the protector portion case, and the compressor motor The current of the positive temperature coefficient thermistor is cut off by being heated and opened by the temperature rise of the compressor outer surface atmosphere due to the operation of the heater and the temperature rise of the heater housing wall surface due to the heat generated by the heater. Overload protector.   It is fitted to an overload protector housing provided in the starting device by a positive temperature coefficient thermistor, and can be attached to a 3-pin glass terminal disposed on the outer shell of the compressor integrally with the starting device. The overload protector according to any one of Items 1 to 7.   A device using the overload protector according to claim 1.

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